I have a sony vaio laptop with a blu ray drive how do I get a firmware upgrade keep it up to date?

I can't watch some of my blu ray movies because it needs a firmware upgrade but I cannot find the right website to download the firmware. My laptop uses windvd programme to watch blu rays and dvd's.I have a sony vaio laptop with a blu ray drive how do I get a firmware upgrade keep it up to date?
A little more detail about your Vaio model would be useful...

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